[CGData] Drop const from a return type (NFC)#140672

kazutakahirata wants to merge 1 commit intollvm:mainllvm/llvm-project:mainfrom

kazutakahirata:cleanup_001_drop_const_llvm_CGDatakazutakahirata/llvm-project:cleanup_001_drop_const_llvm_CGDataCopy head branch name to clipboard